Twyer.



W. D. ROSS, JR.

TWYER. v APPLICATION FILED JAN- l6, I9I8.

1,279,446. Patented Sept. 17,1918.

WALTER D. ROSS, JR., 0F ANNISTON, ALABAMA.

its.

TWYER.

Specification of Letters Patent. Patented Sept. 17, 1918.

Application filed January 16, 1918. Serial No. 212,034.

To all whom it may concern: .Be it known that I, WALTER D. Ross, J12, acitizen of the United States, residing at Anniston, in the county ofCalhoun and State of Alabama, have invented certain new and usefulImprovements in Twyers, of which the following is a specification.

This invention relates totwyers and has special reference to twyers ofthe type disclosed in Letters Patent No. 1,205,568, granted to meNovember 21, 1916. One object of the present invention is to provide aconstruction whereby an increased volume of air will be admitted to thelower twyer and the blast issuing from said twyer thereby strengthened.A further object of the invention is to improve the construction andfacilitate the removal of broken or burnt out parts.

The invention is illustrated in the accom panying drawings, in which IFigure 1 is a'vertical section of a cupola furnace having my improvedtwyers incor-- porated therein; 7

Fig. 2 is a horizontal section on the line 2-2 of Fig. 1;

Fig. 3 is a plan view of a portion of the lower twyer;

' vcnicnt source of air 'under pressure.

Fig. 4 is a detail perspective View of the parts of the lower twyerseparated but in their proper relative positions;

Fig. 5 is a detail perspective view of the channel member which extendsbetween the filler blocks. I

The cupola furnace 1 may be of the usual or any preferred constructionand is equipped with the usual annular inclosing air box 2 connectedthrough a conduit 3 with any con- Upper and lower twyers are embedded inthe wall of the furnace to admit air from the air box to the combustionchamber of" the furnace and direct the air currents onto the metal.

In carrying out my present invention, I employ at each lower twyer alower twyer plate 4 which is substantially of the same construction asthe lower twyer plate disclosed in my aforesaid patent, there being adivision block 5 at its center and posts 6 at its ends, the inner wallsof said posts convergmg outwardly and the posts and division blocksbeing inte ral with the twyer-plate or separate thcrefi'om and restedthereon as may be preferred: The upper twyer plate 7 rests at its endsupon the posts 6 and bridges the space between them, resting at itscenter upon the division block 5. This twyer plate 7 is equal in widthto about half the width of the lower twyer plate and is of arcuate form,being of the same inside radius as the lower twyer plate and the furnacewall, and all the mentioned parts being built into the wall of thefurnace as will be read- 'ily understood and as shown in Fig. 1 of theductm m mber is substantially an angle bar curved longitudinally tocorrespond to the arcuate form of the twyenplate and having a verticalflange 9 at its inner side whichbears against the outer edg of the uppertwyer plate 7. An upper horizontal. flange 10 extends outwardly from theupper edge of the flange 9' and this flange 1.0 is constructed at itscenter with a notch 11 and at its ends with notches 12, While from theouter edge of said flange 10 at the ends thereof are depending flangesor feet 13 which are designed to bear upon the upper surfaces of theadjacent posts 6 and have their inner terminal edges meeting the innervertical walls of the said posts. It will thus be readily seen that anopen space is )rovided at the outer side of and above t e lower. twyerplate so that a greater volume of air a so; a

may be admitted to the twyer than could be admitted by the space betweenthe outer terfilling blocks are wedge-shaped and prefer-- ably areprovided in two sizes which are arranged alternately. By providing aplurality of the blocks alternately of different sizes I am, enabled tofit the blocks in place readily, and easily attain the desireduniformity of the inner surface of the furnace wall adj accnt theblocks. As shown clearly 11o in Fig. 1 the inner ends of these severalfilling bloclcs are projected beyond the inner it that ends of the posts6 and the twyer plates so that the furnace lining may be made thickerabove the said blocks, and the under surface of the inner ends of theblocks are beveled, as shown, so that the air blast may spread as itemerges from the twyers. Resting upon the air directing member 8, andcoinciding with the notches 11 and 12 therein, are air conveying channelmembers 15 which are set into the outer surface of the furnace Wall atintervals around the same and are provided near their upper ends withopenings 16 around which on their inner surfaces are bosses 17. Theupper twyers or nozzles 18 are set in the furnace wall in an inclinedposition, as shown in Fig. 1, and have, their upper. ends beveled sothat they will fit within the circular opening 16 and the bosses l7 andform a tight joint therewith. As the: upper twyers or nozzles areinclined downwardly and inwardly, the air will be directed mostefficiently upon the charge Within 'the furnace.

It will be readily noted from the fore going description taken inconnection with the accompanying drawings, that the channel members 15are disposed vertically and their upper ends are closed while theirlower ends are open, said members consisting substantlally of an innerplate 21, having outwardly extending flanges 22 at its side edgesconnected by a flange or web 23 at its upper end. The lower ends of themembers rest upon the air directing members 8 around the notchestherein, and the space between the flanges 22 is open to the air box "2so the air. entering the said box and filling the same will at onceenter the channel members and pass therefrom into the interior of theair-conveying members 8 and Will be thereby crowded into the divergingpassages through the lower twyers while the air admitted to the upperends of the channel members will pass through the nozzles or uppertwyers 18. 'It will be readily noted that the ends of the air directingmembers 8 are disposed between the inlet openings of the lower twyermembers inasmuch as the are supported by the posts at the ends of the ofthe' air admitted to lower twyer. members. The greater portion thechannel members,

at the ends of the lower twyers, will, conseinmate as will be readilyunderstood. I am, there-' fore, enabled to increase the volume of airdirected upon the charge of ore without increasing the size ordimensions of the furnace and as a greater volume of air will bepermitted to pass through the twyers the life of the parts exposed tothe heat will be prolonged. The hollow construction of these parts alsoreduces the quantity of metal necessary and the "provision of additionalair passages and upper twyers effects a more equal distribution of theair. The device is exceedingly simple in the construction andarrangement of its parts and may be applied to any furnace now in use ata low cost. It very often happens, especially in large operations, thatthe upper twyer plate 7 will be burnt oil and the filler blocks 14 beburnt out in sections. Sometimes, parts of the posts 6 are burnt off. Myconstruction permits the burnt member to be easily withdrawn and a newmember substituted therefor without requiring an entire section to betorn out and rebuilt.

Having thus described the invention, what is claimed as new is:

1. The combination of a lower plate, posts at the ends twyer platesupported b Y said posts and bridging the space between the same at theinner side of the lower twyer plate, and an air-conveying membersupported by said posts and bridging and communicating twyer with. thespace between them, at the outer side thereof.

2. The comblnatlon of a lower vtwycr plate, posts at the ends thereof,an upperv WALTER D. ROSS, J3. [L.s.]

thereof, an upper.

